【Voice Changing Function】Supports changing female/kids voices to a male voice for enhanced security. Ideal for situations when alone at home. Provides options for original and male voice modes 【Infrared Night Vision】Equipped with infrared lights for supplemental illumination. Ensures clear imaging with a uniform light source. Automatically activates night vision for enhanced safety after dark 【HD Wide-Angle Lens】Features a wide lens with an HD night vision sensor. Delivers better imaging quality even in low-light environments. Capable of capturing clear visuals in completely dark conditions, supported by infrared light 【Family Sharing Function】Allows sharing with up to 9 family members. Video messages from the doorbell are sent to all connected users, with the first responder able to engage in a visual conversation with the visitor 【Real-Time Monitoring】Supports real-time monitoring of the area in front of your door via a dedicated app. Built-in PIR sensor detects motion, captures images, and pushes alerts to your smartphone instantly 【Built-In Ringtones】Built-in with 38 pre-installed ringtones. Volume can be adjusted to suit your preference Specifications: Model: i9 Interface: Type-C Dimension: 110*55*36mm(Doorbell), 60*44*26mm(Indoor Unit) Doorbell battery capacity: 4000mAh